Effects of soil permeability improvement and purification of pollutants in urban green space under different matrix composition amendments

doi:10.13287/j.1001-9332.202004.037

Abstract

Abstract: Green land is important carrier in cities. We investigated the effects of soil permeability improvement and purification of pollutants under different matrix composition amendments in Xixian New Area, Shaanxi Province. Six materials, including biochar, vermiculite, perlite, compost, polyacrylamide (PAM) and coir, were mixed with basic materials that were composed of soil and sand (volume ratio of 4:4), and then incubated for 30 days. We analyzed bulk density, saturated hydraulic conductivity, saturated moisture, and total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD), copper (Cu), zinc (Zn), cadmium (Cd) concentrations in pollutants. For biochar and compost with volume ratio of 0.5:1.5 (Ⅰ) and 1:1 (Ⅱ), 1%PAM application had the best effect on soil permeability (including bulk density, saturated hydraulic conductivity, and saturated moisture). The effect purification of TN and COD was better under the condition of biochar and compost (Ⅰ) with 0.5% PAM amendment than that with 1% PAM amendment. Under biochar and compost (Ⅰ) with 1%PAM treatment, the adsorption rate of Zn, Cd, Cu was 99.9%, 99.7%, and 97.2%, respectively. In general, biochar and compost (volume ratio of 0.5:1.5) with 1% PAM could be recommended as the media of the sponge city green land in Xixian New Area.

HAO Shan, WANG Chen-guang, ZHANG A-feng, WANG Xu-dong, MA Xiao, MA Yue. Effects of soil permeability improvement and purification of pollutants in urban green space under different matrix composition amendments[J]. Chinese Journal of Applied Ecology, 2020, 31(4): 1349-1356.

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